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The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in $$t{\bar{t}}$$...

A measurement of $$W^\pm $$ W± boson production in Pb+Pb collisions at $$\sqrt{s_\mathrm {NN}} = 5.02~\text {Te}\text {V}$$ sNN=5.02Te is reported using data recorded by the ATLAS experiment at the LHC in 2015, corresponding to a total integrated luminosity of $$0.49\;\mathrm {nb^{-1}}$$ 0.49nb-1 . The $$W^\pm $$ W± bosons are reconstructed in the electron or muon leptonic decay channels. Production...

The production cross-sections for $$W^{\pm }$$ W± and Z bosons are measured using ATLAS data corresponding to an integrated luminosity of 4.0 pb$$^{-1}$$ -1 collected at a centre-of-mass energy $$\sqrt{s}=2.76$$ s=2.76 TeV. The decay channels $$W \rightarrow \ell \nu $$ W→ℓν and $$Z \rightarrow \ell \ell $$ Z→ℓℓ are used, where $$\ell $$ ℓ can be an electron or a muon. The cross-sections are...

Abstract The problems of neutrino masses, matter-antimatter asymmetry, and dark matter could be successfully addressed by postulating right-handed neutrinos with Majorana masses below the electroweak scale. In this work, leptonic decays of W bosons extracted from 32.9 fb−1 to 36.1 fb−1 of 13 TeV proton–proton collisions at the LHC are used to search for heavy neutral leptons (HNLs) that are produced...

A measurement of fiducial and differential cross-sections for $$W^+W^-$$ W+W- production in proton–proton collisions at $$\sqrt{s}=13$$ s=13 TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 36.1 $$\hbox {fb}^{-1}$$ fb-1 is presented. Events with one electron and one muon are selected, corresponding to the decay of the diboson system...

Abstract The differential cross section for isolated-photon production in pp collisions is measured at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 36.1 fb−1. The differential cross section is presented as a function of the photon transverse energy in different regions of photon pseudorapidity. The differential cross section as a function...

The inclusive cross-section for jet production in association with a Z boson decaying into an electron–positron pair is measured as a function of the transverse momentum and the absolute rapidity of jets using 19.9 fb$$^{-1}$$ -1 of $$\sqrt{s}=8$$ s=8 TeV proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The measured $$Z\text { + jets}$$ Z+ jets cross-section...

This paper describes a study of techniques for identifying Higgs bosons at high transverse momenta decaying into bottom-quark pairs, $$H \rightarrow b\bar{b}$$ H→bb¯ , for proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy $$\sqrt{s}=13$$ s=13 $$\text {TeV}$$ TeV . These decays are reconstructed from calorimeter jets found with the...

Abstract This paper presents a measurement of ZZ production with the ATLAS detector at the Large Hadron Collider. The measurement is carried out in the final state with two charged leptons and two neutrinos, using data collected during 2015 and 2016 in pp collisions at s $$ \sqrt{s} $$ = 13 TeV, corresponding to an integrated luminosity of 36.1 fb−1. The integrated cross-sections in the total...

A search for excited electrons produced in pp collisions at $$\sqrt{s}$$ s = 13 $$\text {Te}\text {V}$$ Te via a contact interaction $$q{\bar{q}}\rightarrow ee^*$$ qq¯→ee∗ is presented. The search uses 36.1 fb$$^{-1}$$ -1 of data collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider. Decays of the excited electron into an electron and a pair of quarks ($$eq{\bar{q}}$$...

This paper presents measurements of the $$W^+ \rightarrow \mu ^+\nu $$ W+→μ+ν and $$W^- \rightarrow \mu ^-\nu $$ W-→μ-ν cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton–proton collisions at a centre-of-mass energy of 8 $$\text {TeV}$$ TeV with the ATLAS experiment at the LHC and correspond to a total...

Abstract Narrow resonances decaying into W W, W Z or ZZ boson pairs are searched for in 139 fb−1 of proton-proton collision data at a centre-of-mass energy of s $$ \sqrt{s} $$ = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018. The diboson system is reconstructed using pairs of high transverse momentum, large-radius jets. These jets are built from a combination...

Searches for scalar leptoquarks pair-produced in proton–proton collisions at $$\sqrt{s}=13$$ s=13 TeV at the Large Hadron Collider are performed by the ATLAS experiment. A data set corresponding to an integrated luminosity of 36.1 fb$$^{-1}$$ -1 is used. Final states containing two electrons or two muons and two or more jets are studied, as are states with one electron or muon, missing transverse...

This paper presents measurements of charged-particle distributions sensitive to the properties of the underlying event in events containing a $$Z$$ Z boson decaying into a muon pair. The data were obtained using the ATLAS detector at the LHC in proton–proton collisions at a centre-of-mass energy of 13 $$\text {Te}\text {V}$$ Te with an integrated luminosity of $$3.2~\text{ fb }^{-1}$$ 3.2fb-1 ....

Abstract A measurement of jet substructure observables is presented using data collected in 2016 by the ATLAS experiment at the LHC with proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV. Large-radius jets groomed with the trimming and soft-drop algorithms are studied. Dedicated event selections are used to study jets produced by light quarks or gluons, and hadronically decaying top quarks...

Algorithms used for the reconstruction and identification of electrons in the central region of the ATLAS detector at the Large Hadron Collider (LHC) are presented in this paper; these algorithms are used in ATLAS physics analyses that involve electrons in the final state and which are based on the 2015 and 2016 proton–proton collision data produced by the LHC at $$\sqrt{s}$$ s = 13 $$\text {TeV}$$...

Abstract A search for a narrow scalar resonance decaying into an opposite-sign muon pair produced in events with and without b-tagged jets is presented in this paper. The search uses 36.1 fb−1 of s = 13 $$ \sqrt{s}=13 $$ TeV proton-proton collision data recorded by the ATLAS experiment at the LHC. No significant excess of events above the expected Standard Model background is observed in...

Abstract Limits are set on the pair production of scalar leptoquarks, where all possible decays of the leptoquark into a quark (t, b) and a lepton (τ, ν) of the third generation are considered. The limits are presented as a function of the leptoquark mass and the branching ratio into charged leptons for up-type (LQ 3u → tν/bτ) and down-type (LQ 3d → bν/tτ) leptoquarks. Many results are reinterpretations...

This paper presents measurements of $$W^{\pm }Z$$ W±Z production cross sections in pp collisions at a centre-of-mass energy of 13 $$\text {TeV}$$ TeV . The data were collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider, and correspond to an integrated luminosity of $$36.1~\hbox {fb}^{-1}$$ 36.1fb-1 . The $$W^{\pm }Z$$ W±Z candidate events are reconstructed using leptonic...

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